diff --git a/libs/ardour/MSVClibardour/ardour.vcproj b/libs/ardour/MSVClibardour/ardour.vcproj
index 25b6d762f0..697bc9d306 100644
--- a/libs/ardour/MSVClibardour/ardour.vcproj
+++ b/libs/ardour/MSVClibardour/ardour.vcproj
@@ -1163,6 +1163,10 @@
 				RelativePath="..\session_vst.cc"
 				>
 			</File>
+			<File
+				RelativePath="..\sha1.c"
+				>
+			</File>
 			<File
 				RelativePath="..\slave.cc"
 				>